It’s just about that time of year, again. And you’ll have to act quickly.

Tickets for the annual Great American Beer Festival (GABF), to be held Oct. 2-4 in Denver, go on sale July 30 at Noon (EDT) via Ticketmaster.com. And event organizers are taking steps to curb scalpers who may have contributed in past years to the event’s sellout in a matter of minutes.

Last year, general admission tickets to the nation’s biggest beer event sold out in just 20 minutes and a sellout this year is expected again. Last year’s sell out led to speculatation that scalpers were attempting to corner the market.

GABF organizers said on the event‘s web site that they are attempting to deal with scalpers.

This year, general admission ticket buyers will be limited to four tickets and organizers further stated: “Unfortunately, the secondary market for popular tickets persists, despite many efforts to thwart it …There are measures in place to decrease access for scalpers, including the ticket limits that we set for GABF ticket purchases and Ticketmaster’s anti-bot and other security measures in their selling system. (Ticketmaster reviews all purchases to enforce our GABF ticket limits.) Again, though, while this decreases access, it unfortunately does not prevent a secondary market. To ensure you have a valid ticket, purchase tickets from authorized outlets only.”

The festival at the Colorado Convention Center in Denver is expected to draw up to 49,000 attendees over four sessions who will have the opportunity to sample almost 3,000 beers from about 700 U.S. breweries.